15
TROUBLESHOOTING GUIDE
Problem
Possible Cause
Action
Pump does not cycle.
No air pressure at supply.
Check air supply.
Pump air-shutoff valve closed.
Open pump air-shutoff valve.
Pump air pressure regulator set too low.
Check pressure regulator setting.
Pump air exhaust muffl
er dirty.
Clean or replace the muffl
er felt. Refer to Section 8.7
of this manual.
Pump air shuttle valve needs cleaning and
lubrication.
Refer to procedure in Section 8.5 of this manual.
Pump air motor worn or damaged.
Contact Milwaukee Cylinder customer service
representative.
Pump element jammed.
Contact Milwaukee Cylinder customer service
representative.
Pump fails to build hydraulic
pressure or builds less than
desired pressure.
Low air pressure or volume at air supply.
Check air supply.
Pump air pressure regulator set too low.
Check regulator setting.
Pump air exhaust muffl
er dirty.
Clean or replace the muffl
er felt. Refer to Section 8.7
of this manual.
Control valve returning oil to reservoir.
Change position of control valve.
Low oil level in reservoir.
Check oil level. Add oil as required.
Pump suction strainer elements dirty.
Replace pump suction strainer elements. Refer to
Section 8.3 of this manual.
Oil leakage at hydraulic hoses, fi ttings or connected
devices.
Replace leaking components as required.
Internal leakage in control valve or valve manifold.
Repair or replace components as required.
Internal leakage in pump element. Pump element
worn or damaged.
Contact Milwaukee Cylinder customer service
representative.
Pump Noise.
Low air pressure or volume at air supply.
Check air supply.
Pump air pressure regulator set too low.
Check regulator setting. Refer to Section 5.9 of this
manual.
Pump air exhaust muffl
er dirty.
Clean or replace the muffl
er felt. Refer to Section 8.7
of this manual.
(continued on next page)
1
2
3
4
Figure 21 - Air Exhaust Muffler
1. Screw
2. Cover
3. Muffl
er Felt
4. Air Shuttle Valve
Key:
9.0 TROUBLESHOOTING
Refer to the troubleshooting guide when diagnosing pump
operational problems. Please note that the troubleshooting guide
is not all-inclusive, and should be considered only as an aid to
help diagnose the most common possible problems.
For repair service, contact Milwaukee Cylinder customer service
representative. As required, also refer to the troubleshooting
information provided with your hydraulic control valves and other
system components.
